The world’s first 3-D printable firearm springs from the same liberating impulse as blogging and other forms of digital activism, says its creator. “If 3-D printing means anything, if the digital revolution and 3-D printing revolution have any...

Nearly half of today’s jobs could be automated within the next two decades, according to one recent study, and no one seems to be prepared for what that will mean for society. The digital revolution, just as the industrial revolution before it,...